989449775 has 6 divisors (see below), whose sum is σ = 1226917752. Its totient is φ = 791559800.

The previous prime is 989449771. The next prime is 989449801. The reversal of 989449775 is 577944989.

It is not a de Polignac number, because 989449775 - 2² = 989449771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989449771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19788971 + ... + 19789020.

It is an arithmetic number, because the mean of its divisors is an integer number (204486292).

Almost surely, 2^989449775 is an apocalyptic number.

989449775 is a deficient number, since it is larger than the sum of its proper divisors (237467977).

989449775 is a wasteful number, since it uses less digits than its factorization.

989449775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39578001 (or 39577996 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 62.

The square root of 989449775 is about 31455.5205806548. The cubic root of 989449775 is about 996.4708178589.

The spelling of 989449775 in words is "nine hundred eighty-nine million, four hundred forty-nine thousand, seven hundred seventy-five".